←Back to Tools

Text Diff Checker - Compare Text & Find Differences

Compare two texts or code files side-by-side or inline to highlight additions, deletions, and changes.

5
Lines Added
4
Lines Removed
0
Lines Changed
4
Lines Unchanged
📄 Original8 lines
📄 Modified9 lines
1function greet(name, greeting = "Hello") {
2 const message = `${greeting}, ${name}!`;
1function greet(name) {
2 const message = "Hello, " + name;
3 console.log(message);
3 console.log(message);
4 return message;
4 return message;
5}
5}
6
6
7// Call the function
8const result = greet("World", "Hi");
9console.log("Result:", result);
7const result = greet("World");
8console.log(result);
🟥Removed lines
🟩Added lines
🟨Changed words
⊟Side-by-side view
☰Inline view

About Diff Checker

Looking for a free online diff checker? Compare two text blocks or code files and instantly see every added, removed, and changed line — with word-level highlighting. Choose between side-by-side and inline views. Works with any plain text, code, JSON, CSV, or config files. No login, no file upload, 100% private.

This diff checker uses a Longest Common Subsequence (LCS) algorithm to compute the minimal set of changes between two texts, giving you the same quality of diff as professional tools like git diff.

Beyond line-level comparison, it also performs word-level diff on changed lines — so you can see exactly which words were modified within a line, highlighted in red and green.

How to Compare Text Online

  1. Paste your original text in the left panel
  2. Paste your modified text in the right panel
  3. Click "Compare" to run the diff
  4. Switch between Split (side-by-side) and Inline views
  5. Toggle "Show unchanged lines" to focus on differences only

Diff Views Explained

  • Split view: Original on the left, modified on the right, aligned by line number — best for reviewing changes
  • Inline view: All lines in a single column with − (removed) and + (added) markers — matches git diff style
  • Word-level diff: On changed lines, individual words that differ are highlighted within the line

Color Legend

  • 🟥 Red: Lines or words that were removed from the original
  • 🟩 Green: Lines or words that were added in the modified version
  • 🟨 Yellow highlight: Word-level changes within a modified line

Use Cases

  • Comparing code before and after a refactor
  • Reviewing changes to configuration files (JSON, YAML, TOML)
  • Proofreading documents and checking edits to legal or contract text
  • Comparing API responses or database query outputs
  • Verifying file migrations and data transformations

FAQ Section

🔥

What algorithm does this diff checker use?

What is word-level diff?

What types of text can I compare?

Is there a file size limit?

Are my texts uploaded to a server?

What is the difference between split and inline view?

diff checker onlinetext compare onlineonline diff toolcompare two files onlinetext difference checkercode diff toolfind differences in textside by side diff online

🔗 You Might Also Like

FileEdit
Markdown Converter
Convert Markdown ↔ HTML with preview
{ }
JSON Formatter
Format and validate JSON data
Database
SQL Formatter
Format and beautify SQL queries
FileDigit
Word Counter
Count words, characters, reading time